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目的探讨四肢神经源性肿瘤的MRI表现特点。方法回顾性分析我院1997年至2004年收治的22例神经源性肿瘤患者(47个肿瘤)的MRI表现。22例患者均行常规MRI扫描,包括T_1WI、T_2WI轴位、冠状位和矢状位扫描,并对其中20例行增强扫描。结果在T_1WI 15例神经鞘瘤、4例神经纤维瘤、1例恶性神经源性肿瘤呈等信号,1例神经纤维瘤、1例恶性神经源性肿瘤呈不均质的低/中等信号。在T_2WI 22例肿瘤均呈高信号,5例神经鞘瘤信号轻度不均,1例恶性神经源性肿瘤信号中度不均匀,1例恶性神经源性肿瘤信号明显不均匀。10例病灶位于皮下,12例病灶位于肌间。所有病变均呈梭形,其中9例两端出现“鼠尾征”。5例出现“靶征”。1例恶性神经源性肿瘤侵犯邻近骨。结论 MRI信号特点可提示神经源性肿瘤的诊断,MRI信号明显不均匀及邻近组织的侵犯可提示恶性神经源性肿瘤。
Objective To investigate the MRI manifestations of neurogenic tumors of limbs. Methods The MRI findings of 22 patients with neurogenic tumors (47 tumors) admitted from 1997 to 2004 in our hospital were retrospectively analyzed. Twenty-two patients underwent MRI scans, including T 1WI, T 2 WI, coronal and sagittal scans, and 20 of them underwent enhanced MRI. Results In T_1WI, 15 cases of schwannoma, 4 cases of neurofibroma and 1 case of malignant neurogenic tumors showed equal signals, 1 case of neurofibromatosis and 1 case of malignant neurogenic tumors, showing heterogeneous low / moderate signals. T_2WI 22 cases of tumors were high signal, 5 cases of schwannoma signal was slightly uneven, a malignant neurogenic tumor signal was uneven, a malignant neurogenic tumor signal was significantly uneven. Ten lesions were located subcutaneously and 12 lesions were located in the intermuscular space. All lesions were fusiform, including 9 cases of both ends of the rat tail sign. 5 cases appeared “target sign ”. One malignant neurogenic tumor invaded the adjacent bone. Conclusion The MRI features can be used to diagnose neurogenic tumors. The obvious MRI signals are not uniform and the adjacent tissues can be invading malignant neurogenic tumors.